/*

  +----------------------------------------------------------------------+

  | Copyright (c) The PHP Group                                          |

  +----------------------------------------------------------------------+

  | This source file is subject to version 3.01 of the PHP license,      |

  | that is bundled with this package in the file LICENSE, and is        |

  | available through the world-wide-web at the following url:           |

  | https://www.php.net/license/3_01.txt                                 |

  | If you did not receive a copy of the PHP license and are unable to   |

  | obtain it through the world-wide-web, please send a note to          |

  | license@php.net so we can mail you a copy immediately.               |

  +----------------------------------------------------------------------+

  | Author:                                                              |

  +----------------------------------------------------------------------+

*/

#include "php.h"

#ifdef USE_STRLCAT_PHP_IMPL

/*     $OpenBSD: strlcat.c,v 1.18 2016/10/16 17:37:39 dtucker Exp $    */

/*

 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,

 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL

 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static const char *rcsid = "$OpenBSD: strlcat.c,v 1.17 2016/10/14 18:19:04 dtucker Exp $";

#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <string.h>

/*

 * Appends src to string dst of size siz (unlike strncat, siz is the

 * full size of dst, not space left).  At most siz-1 characters

 * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).

 * Returns strlen(src) + MIN(siz, strlen(initial dst).

 * If retval >= siz, truncation occurred.

 */

PHPAPI size_t php_strlcat(char *dst, const char *src, size_t siz)

{

  const char *d = dst;

  const char *s = src;

  size_t n = siz;

  size_t dlen;

  /* Find the end of dst and adjust bytes left but don't go past end */

  while (n-- != 0 && *dst != '\0')

    dst++;

  dlen = dst - d;

  n = siz - dlen;

  if (n-- == 0)

    return(dlen + strlen(src));

  while (*src != '\0') {

    if (n != 0) {

      *dst++ = *src;

      n--;

    }

    src++;

  }

  *dst = '\0';

  return(dlen + (src - s));

}

#endif /* !HAVE_STRLCAT */